Transmission method and device of audio/video signals of composite video

Abstract

The invention relates to the field of signal transmission, in particular to a transmission method and a device of audio / video signals of composite video so as to solve the problems that in the prior video and audio monitoring technology, video signals and audio signals are transmitted respectively, and therefore the video signals and the audio signals are not synchronous. The transmission method includes steps of obtaining the audio signals through sampling within a line synchronization time when aiming at a line of video signals, carrying out amplitude adjustment and amplitude modulation on amplitude values of the audio signals obtained through sampling, obtaining modulating signals of the audio signals, converting a part of video amplitude modulation signals in a line blanking time area of the line video signals into modulation signals of the video signals, and then sending out the converted line video signals. The phenomenon that the video signals and the audio signals are prone to not synchronous at a receiving end when the video signals and the audio signals are transmitted respectively can be avoided, and synchronous and collinear transmission of the video and the audio is achieved.

Description

technical field [0001] The invention relates to the field of signal transmission, in particular to a method and device for transmitting audio and video signals of composite video. Background technique [0002] With the rapid development of information technology, more and more remote network video and audio monitoring technologies have been applied in the security field. At present, the video and audio monitoring equipment used is mainly to install the audio acquisition equipment and video acquisition equipment closer together, or to embed the audio acquisition function in the video equipment, so that the video signal and audio signal can be transmitted independently through different transmission lines. [0003] When the video signal and the audio signal are transmitted, two transmission cables need to be arranged, that is, a video coaxial cable and an audio signal cable. During the transmission process, the video signal and audio signal are not transmitted synchronously, ...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a composite video audio and video signal transmission method and its device, to solve the current video and audio monitoring technology, the video and audio signals are transmitted separately, and the problem that the video signal and the audio signal are easy to be out of sync, and easily Inconvenience in the construction and maintenance of transmission cables

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